Comment on 'Vindication of entanglement-based witnesses of non-classicality in hybrid systems'
| Autor: | Hall, Michael J. W., Reginatto, Marcel |
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| Rok vydání: | 2021 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | Models of quantum-classical interactions fall into two classes: those which allow the generation of quantum entanglement via a classical mediator (such as gravity), and those which do not. Marconato and Marletto have recently sought to distinguish between these classes by claiming that known members of the first class (based on the configuration-ensemble formalism introduced by us) fail to model the mediator as a 'classical' system, and are nonlocal. We explicitly show that this claim is incorrect, and expose a large number of errors and misconceptions in their reasoning. We also point to a very simple and transparent example of the generation of entanglement between two qubits via a classical bit. It follows that there are models permitting the generation of entanglement via quantum-classical interactions that lie outside the remit of the theorem cited by Marconato and Marletto. We clarify the reasons for the limited applicability of various no-go theorems for entanglement generation. Comment: v2: Noted that configuration-ensemble models are fully local (with {C, Q} = 0 for all classical and quantum observables C and Q) when the classical and quantum systems are initially independent (as assumed in all relevant no-go theorems) |
| Databáze: | arXiv |
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